Bump github.com/Sirupsen/logrus from 1.4.1 to 1.4.2

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Bumps github.com/Sirupsen/logrus from 1.4.1 to 1.4.2.

Changelog

*Sourced from [github.com/Sirupsen/logrus's changelog](https://github.com/sirupsen/logrus/blob/master/CHANGELOG.md).* > # 1.4.2 > * Fixes build break for plan9, nacl, solaris

Commits

- [`839c75f`](https://github.com/sirupsen/logrus/commit/839c75faf7f98a33d445d181f3018b5c3409a45e) Release 1.4.2 - [`cfb9d25`](https://github.com/sirupsen/logrus/commit/cfb9d25dff21c2b1297e170b3d8081ab1c7728f2) Merge pull request [#969](https://github-redirect.dependabot.com/Sirupsen/logrus/issues/969) from sirupsen/plan9_build - [`744fc4c`](https://github.com/sirupsen/logrus/commit/744fc4caad20588e394ddd7a1af4d7a9ecabe3ac) fix build break for plan9 - [`e0108d9`](https://github.com/sirupsen/logrus/commit/e0108d928514495af0dc38f7d592a3a7f5b68230) Merge pull request [#966](https://github-redirect.dependabot.com/Sirupsen/logrus/issues/966) from nlepage/feature/nacl - [`f2849a8`](https://github.com/sirupsen/logrus/commit/f2849a8fb20867468d5da0ea8137484d49c12bd7) add full cross compilation in travis ([#963](https://github-redirect.dependabot.com/Sirupsen/logrus/issues/963)) - [`1bc909a`](https://github.com/sirupsen/logrus/commit/1bc909a4f82b24e40552305da4a6907cabc48e66) Add a checkTerminal for nacl to support running on play.golang.org - [`f0375eb`](https://github.com/sirupsen/logrus/commit/f0375eb5b588893ff556c71dee32d98e57a9b777) Merge pull request [#961](https://github-redirect.dependabot.com/Sirupsen/logrus/issues/961) from sirupsen/ci_build_matrix - [`1a601d2`](https://github.com/sirupsen/logrus/commit/1a601d20598f07b6397f1c2b3c7d659e3d1b4894) remove go 1.10 from ci build matrix - [`5521996`](https://github.com/sirupsen/logrus/commit/5521996833c095f5ac75d99687cef8ad344ded12) Update x/sys/unix to fix AIX support - [`9b3cdde`](https://github.com/sirupsen/logrus/commit/9b3cdde74fbe9443d704467498a7dcb61a79de9b) Merge pull request [#946](https://github-redirect.dependabot.com/Sirupsen/logrus/issues/946) from sirupsen/solaris_build - Additional commits viewable in [compare view](https://github.com/Sirupsen/logrus/compare/v1.4.1...v1.4.2)

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Superseded by #55.